How to get the regression from 2 vectors

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Shani 2013-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/107243-how-to-get-the-regression-from-2-vectors

编辑： Image Analyst 2013-11-23

Hi, I have 2 vectors and I would like to know the R^2 ie the regression of the line. I would like a line of best fit to show on the plot and the two vectors one on y and one on x axis thanks

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Image Analyst 2013-11-23

编辑：Image Analyst 2013-11-23

Here is what Shani asked, so that it will still be here when she deletes this question:

subject line: How to get the regression from 2 vectors

Hi, I have 2 vectors and I would like to know the R^2 ie the regression of the line. I would like a line of best fit to show on the plot and the two vectors one on y and one on x axis thanks

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Answer 1

Image Analyst 2013-11-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/107243-how-to-get-the-regression-from-2-vectors#answer_116082

在 MATLAB Online 中打开

Try this demo:

% Create sample data and plot it.
x = 1:10;
y = 3*x - 20 + 4*rand(1, length(x)); % Some equation
plot(x, y, 'r*', 'MarkerSize', 15);
grid on;
% Get the fit
coeffs = polyfit(x, y, 1);
% Get the x values for the fit at higher resolution.
xFit = linspace(x(1), x(end), 300);
% Get the estimated y values
yFit = polyval(coeffs, xFit);
% Plot them as a line.
hold on;
plot(xFit, yFit, 'b-', 'LineWidth', 3);